CN110668875B - Production method of high-sulfur full-water-soluble nitro-sulfur-based nitrogen fertilizer particles - Google Patents
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Abstract
The invention discloses a production method of high-sulfur fully-water-soluble nitro-sulfur-based nitrogen fertilizer particles. The production method comprises the following steps: 1) concentrating ammonium nitrate into 99% ammonium nitrate solution, and feeding the ammonium nitrate solution accounting for 44-58% of the total mass ratio into a first-stage mixing tank; 2) simultaneously adding a thickening agent accounting for 1-2% of the total mass ratio, a conditioning agent accounting for 2-4% of the total mass ratio and solid ammonium sulfate accounting for 25-35% of the total mass ratio after metering into a primary mixing tank, and fully mixing under the stirring action; 3) solid ammonium sulfate accounting for 13-20% of the total mass ratio, the screened return materials of the finished product and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, and are uniformly mixed under the strong stirring action; 4) and (3) the slurry is continuously and strongly stirred in a third-stage mixing tank, the slurry in the overflowing mixing tank is fully ground and porphyrized through shearing and emulsification, the overflowing slurry enters a mechanical granulator, the granulator sprays the slurry, and the non-caking quick-acting long-acting efficient full-water-soluble high-ammonium nitrogen nitro-sulfur nitrogen fertilizer is obtained through air cooling, screening, cooling by a second-stage powder flow cooler and spraying DMPP in a film coating machine.
Description
Technical Field
The invention belongs to the technical field of fertilizer production, and particularly relates to a production method of high-sulfur fully-water-soluble nitro nitrogen fertilizer granules.
Background
At present, the domestic nitro-fertilizer has the conditions of higher nitrate nitrogen content and lower ammonium nitrogen content which meet the requirements of plant growth, so that the excessive nitrate nitrogen can cause the leaching loss of nitrogen, thereby not only causing the great waste of nitrogen fertilizer and increasing the agricultural investment cost, but also causing the serious pollution of surface water and underground water, causing the eutrophication of water body and seriously damaging the ecological balance; the low ammonium nitrogen causes insufficient fertilizer efficiency 'late strength' in the using process, has a fertilizer removal phenomenon, and often needs secondary topdressing, which is particularly obvious on field crops, so that the ammonium nitrogen in the nitrate-based fertilizer needs to be improved urgently to meet the later-period needs of plants; the method improves the ammonium nitrogen and adds the nitrification inhibitor to reduce the conversion of the ammonium nitrogen to the nitrate nitrogen, can improve the utilization rate of the nitrogen fertilizer and reduce the use times of the nitrogen fertilizer, and can be generally applied once without topdressing.
For various crops which are favored by nitrogen and sulfur, including economic crops such as cruciferae, allium fistulosum and the like, a composite nitro-sulfur nitrogen fertilizer containing nitrate nitrogen and high sulfur is needed to meet the growth requirement; at present, the water and fertilizer integration is widely popularized in China, and has the advantages of saving fertilizer and water, saving labor force, uniformly carrying out drip irrigation, improving the crop yield and the like, and the most ideal fertilizing mode of cash crops is the drip irrigation, so that the production of the full-water-soluble nitrate-nitrogen-containing high-sulfur compound granular nitrogen fertilizer can meet the demand, and the compound fertilizer in the market is blank at home.
The production process of the fertilizer is that a large amount of solid ammonium sulfate and molten ammonium nitrate are added into a melting and mixing device at the same time in proportion, and then the fertilizer is obtained by spraying and granulating. In the mixing process, the ammonium sulfate solid is only suspended in the ammonium nitrate molten liquid and cannot be organically combined together, so that a co-melt body cannot be formed, slurry is thick in the production process, and the produced granular product has the advantages of more foreign particles, low strength, easiness in caking and pulverization, incapability of continuous normal production and industrial difficulty.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for producing quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer granules, so as to solve the blank of the prior domestic production of fully-water-soluble, high-sulfur and high-ammonium nitrogen nitro-sulfur nitrogen fertilizer, and achieve the purposes of drip irrigation and quick-acting and long-acting effects.
The invention also aims to provide the quick-acting long-acting high-sulfur fully water-soluble nitro-sulfur nitrogen fertilizer granules produced by the production method, which have the properties of high ammonium nitrogen and sulfur content, quick-acting long-acting function, full water solubility and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a production method of high-sulfur fully-water-soluble nitro-sulfur-based nitrogen fertilizer particles, which comprises the following steps:
1) concentrating ammonium nitrate into 99% ammonium nitrate solution, and feeding the ammonium nitrate solution accounting for 44-58% of the total mass ratio into a first-stage mixing tank;
2) simultaneously adding a thickening agent accounting for 1-2% of the total mass ratio, a conditioning agent accounting for 2-4% of the total mass ratio and solid ammonium sulfate accounting for 25-35% of the total mass ratio after metering into a primary mixing tank, and fully mixing under the stirring action;
3) solid ammonium sulfate accounting for 13-20% of the total mass ratio, the screened return materials of the finished product and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, and are uniformly mixed under the strong stirring action;
4) and (3) the slurry is continuously and strongly stirred in a third-stage mixing tank, the slurry in the overflowing mixing tank is fully ground and porphyrized through shearing and emulsification, the overflowing slurry enters a mechanical granulator, the granulator sprays the slurry, and the non-caking quick-acting long-acting efficient full-water-soluble high-ammonium nitrogen nitro-sulfur nitrogen fertilizer is obtained through air cooling, screening, cooling by a second-stage powder flow cooler and spraying DMPP in a film coating machine.
Further, in the step 1), the ammonium nitrate is concentrated into 99% ammonium nitrate solution, and the ammonium nitrate solution is conveyed to a high tower ammonium nitrate through a melting pump for secondary evaporation; the metering is via a mass flow meter.
Further, in the step 1), the added ammonium nitrate solution accounts for 44% of the total mass ratio.
Further, in the step 2), the metering is carried out by a metering belt below the tower; the temperature of the intensive mixing is controlled to 165-170 ℃; the thickening agent is sodium dodecyl sulfate or sodium dodecyl sulfate; the conditioning agent is polyvinyl acetate or polyacrylamide.
Further, in the step 2), the added thickening agent accounts for 1% of the total mass ratio; the added conditioner accounts for 3 percent of the total mass ratio.
Further, in step 3), the temperature of the secondary mixing tank is controlled to 165-168 ℃.
Further, the step 3) further comprises the step of fully grinding and grinding the overflowing mixed slurry through shearing and emulsifying by a No. 1 pipeline type emulsifying machine, and overflowing the mixed slurry into a three-mixing tank.
Further, in the step 4), the temperature of the three-stage mixing tank is controlled at 165-168 ℃.
Further, in step 4), the temperature of the tertiary mixing tank was controlled at 165 ℃.
Further, in the step 4), the overflowed slurry of the mixing tank is sheared, emulsified and sufficiently ground and finely ground by a No. 2 horizontal emulsifying machine.
Further, in the step 4), the dosage of the DMPP is 3-5 kg.
Further, in the step 4), the dosage of the DMPP is 5 kg.
The invention provides the quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer prepared by the method, wherein the nitrate nitrogen content of the quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer is more than or equal to 8%, the ammonium nitrogen content is more than or equal to 18%, and the sulfur content is more than or equal to 9%.
Furthermore, the quick-acting and long-acting high-sulfur full-water-soluble nitro-sulfur nitrogen fertilizer has full water solubility, and the content of water-insoluble substances is less than or equal to 0.01 percent; and (3) spraying a nitrification inhibitor DMPP outside the particles.
Compared with the prior art, the invention has the following beneficial effects:
the method is characterized in that a thickening reducing agent and a conditioner which are independently researched and developed by the company, unique production equipment and strict index control are added into molten slurry, so that the problems that the slurry is thick in the production process, granular products are large in foreign particles, low in strength, easy to agglomerate and pulverize and incapable of realizing continuous large-scale production are solved.
Secondly, the produced product has nitrate nitrogen more than or equal to 8 percent, ammonium nitrogen more than or equal to 18 percent and sulfur content more than or equal to 9 percent, has high ammonium nitrogen and sulfur content, has quick-acting and long-acting function by spraying the nitrification inhibitor DMPP outside the particles, and achieves the aim of one-time fertilization without secondary topdressing.
Thirdly, the produced product has full water solubility, and the content of the water insoluble substance is less than or equal to 0.01 percent, thereby meeting the requirement of drip irrigation production.
Drawings
FIG. 1 is a schematic flow diagram of the equipment required by the production method of the quick-acting and long-acting high-sulfur fully water-soluble nitro-sulfur nitrogen fertilizer granules.
Detailed Description
Referring to fig. 1, the production method and the required equipment of the quick-acting and long-acting high-sulfur fully water-soluble nitro-sulfur nitrogen fertilizer granule of the invention comprise the following steps:
1) ammonium nitrate is conveyed to a high tower ammonium nitrate by a melting pump for secondary evaporation, concentrated into 99 percent ammonium nitrate solution, and the ammonium nitrate solution accounting for 44 to 58 percent of the total mass ratio enters a primary mixing tank after being measured by a mass flow meter.
2) Simultaneously, a thickening agent (sodium dodecyl sulfate or sodium dodecyl sulfate) accounting for 1-2% of the total mass ratio, a conditioning agent (polyvinyl acetate or polyacrylamide) accounting for 2-4% of the total mass ratio and solid ammonium sulfate accounting for 25-35% of the total mass ratio are added into a primary mixing tank and fully mixed under the stirring action, and the temperature is controlled to 165-170 ℃.
3) And solid ammonium sulfate accounting for 13-20 percent of the total mass ratio, the screened return materials of the finished product and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, the mixture is uniformly mixed under the strong stirring action, the overflowing mixed slurry is sheared, emulsified and fully ground and porphyrized by a 1# pipeline type emulsifying machine, the overflowing mixed slurry enters a tertiary mixing tank, and the temperature of the secondary mixing tank is controlled to 165-168 ℃.
4) The slurry is continuously and strongly stirred in a third-stage mixing tank, the temperature is controlled to be 165 ℃, the slurry of the mixing tank overflowing out is sheared, emulsified and fully ground and refined again through a 2# horizontal emulsifying machine, the overflowing enters a mechanical granulator, the granulator sprays the slurry, the slurry is cooled through a tower bottom roller, the screening and a second-stage powder flow cooler, and 3-5 kg of DMPP is sprayed in a film coating machine, so that the non-caking quick-acting long-acting full-water-soluble high-sulfur high-ammonium nitrogen nitro-sulfur nitrogen fertilizer (the content of ammonium nitrogen is more than or equal to 18 percent, and the content of sulfur is more than or equal to 9 percent) is obtained
Compared with the prior art, the core technical method for solving the problems comprises the following steps:
the conditioner sodium dodecyl sulfate or sodium dodecyl sulfate which is independently researched and invented by our company is added, accounting for 2-4% of the total mass ratio, so that the appearance of the particles can be improved, foreign particles can be reduced, the strength of the particles can be increased, and the product is not caked or pulverized.
Secondly, polyvinyl acetate or polyacrylamide which is a thickening agent and independently researched and invented by our company is added, accounting for 1-2% of the total mass ratio, so that the viscosity of the mixed slurry can be adjusted, and the fluidity can be enhanced.
The mixing device is designed into a three-stage mixing tank, so that the temperature of slurry can be increased, the slurry is more uniform, and the product is more mellow.
And fourthly, designing a pipeline type emulsifying machine for the second-stage mixing tank and designing a horizontal type emulsifying machine for the third-stage mixing tank, so that coarse solid components in the slurry can be further ground and levigated, the homogeneity degree of the slurry is improved, and frequent blockage of a granulation spray head is avoided.
Controlling the temperature in the production process to be more than 165 ℃, thus reducing the foreign particles and the water in the product.
And sixthly, spraying the finished product particles with 0.5 percent of nitrification inhibitor DMPP by mass percent, so that the conversion of ammonium nitrogen to nitrate nitrogen can be delayed, and the fertilizer effect is longer.
Example 1
A production method of quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer granules comprises the following process steps:
1) 95% of ammonium nitrate produced by an ammonium nitrate device is conveyed to a high tower ammonium nitrate through a melting pump for secondary evaporation, the ammonium nitrate is concentrated into 99% of ammonium nitrate solution, and the ammonium nitrate solution accounting for 44% of the total mass ratio after being measured by a mass flow meter enters a primary mixing tank; and simultaneously, adding a thickening agent (sodium dodecyl sulfate) accounting for 1 percent of the total mass ratio, a conditioning agent (polyvinyl acetate) accounting for 3 percent of the total mass ratio and solid ammonium sulfate accounting for 35 percent of the total mass ratio into a primary mixing tank, and fully mixing under the stirring action, wherein the temperature is controlled to be 165-170 ℃.
2) And the solid ammonium sulfate accounting for 17 percent of the total mass ratio and the screened return materials of the finished products and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, the mixture is uniformly mixed under the strong stirring action, the overflowing mixed slurry is sheared, emulsified and fully ground and refined through a 1# pipeline type emulsifying machine, the overflow enters a tertiary mixing tank, and the temperature of the secondary mixing tank is controlled to 165-168 ℃.
3) And (2) the slurry is continuously and strongly stirred in a third-stage mixing tank, the temperature is controlled to be 165 ℃, the overflowed slurry of the mixing tank is sheared, emulsified and fully ground and refined again through a No. 2 horizontal emulsifying machine, the overflowed slurry enters a mechanical granulator, the granulator sprays the slurry, the slurry is cooled through a tower bottom roller, the slurry is sieved, a second-stage powder flow cooler is used for cooling, and 5 kilograms of DMPP is sprayed in a film coating machine, so that the non-caking quick-acting long-acting water-soluble high-sulfur high-ammonium nitrogen nitro-sulfur nitrogen based nitrogen fertilizer 26-0-0 (the content of ammonium nitrogen is more than or equal to 18 percent, and the content of sulfur is more than or equal to 13 percent) is obtained.
Example 2
A production method of quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer granules comprises the following process steps:
1) 95% of ammonium nitrate produced by an ammonium nitrate device is conveyed to a high tower ammonium nitrate through a melting pump for secondary evaporation, the ammonium nitrate is concentrated into 99% of ammonium nitrate solution, and the ammonium nitrate solution accounting for 51% of the total mass ratio enters a primary mixing tank after being measured by a mass flow meter; and simultaneously, adding a thickening agent (sodium dodecyl sulfate) accounting for 1 percent of the total mass ratio, a conditioning agent (polyvinyl acetate) accounting for 3 percent of the total mass ratio and solid ammonium sulfate accounting for 25 percent of the total mass ratio into a primary mixing tank, and fully mixing under the stirring action, wherein the temperature is controlled to be 165-170 ℃.
2) And the solid ammonium sulfate accounting for 20 percent of the total mass ratio and the screened return materials of the finished products and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, the mixture is uniformly mixed under the strong stirring action, the overflowing mixed slurry is sheared, emulsified and fully ground and refined through a 1# pipeline type emulsifying machine, the overflow enters a tertiary mixing tank, and the temperature of the secondary mixing tank is controlled to 165-168 ℃.
3) And (2) the slurry is continuously and strongly stirred in a third-stage mixing tank, the temperature is controlled to be 165 ℃, the overflowed slurry of the mixing tank is sheared, emulsified and fully ground and refined again through a No. 2 horizontal emulsifying machine, the overflowed slurry enters a mechanical granulator, the granulator sprays the slurry, the slurry is cooled through a tower bottom roller, screened and cooled by a second-stage powder flow cooler, and 5 kilograms of DMPP is sprayed in a film coating machine, so that the non-caking quick-acting long-acting water-soluble high-sulfur high-ammonium nitrogen and nitro-sulfur nitrogen fertilizer is obtained, wherein the content of the ammonium nitrogen is more than or equal to 18 percent, and the content of the sulfur is more than or equal to 11 percent.
Example 3
A production method of quick-acting and long-acting high-sulfur fully-water-soluble nitro-sulfur nitrogen fertilizer granules comprises the following process steps:
1) 95% of ammonium nitrate produced by an ammonium nitrate device is conveyed to a high tower ammonium nitrate through a melting pump for secondary evaporation, the ammonium nitrate is concentrated into 99% of ammonium nitrate solution, and the ammonium nitrate solution accounting for 58% of the total mass ratio after being measured by a mass flow meter enters a primary mixing tank; and simultaneously adding a thickening agent (sodium dodecyl sulfate) accounting for 1 percent of the total mass ratio, a conditioning agent (polyacrylamide) accounting for 3 percent of the total mass ratio and solid ammonium sulfate accounting for 25 percent of the total mass ratio into a primary mixing tank, and fully mixing under the stirring action, wherein the temperature is controlled to be 165-170 ℃.
2) And the solid ammonium sulfate accounting for 13 percent of the total mass ratio and the screened return materials of the finished products and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, the mixture is uniformly mixed under the strong stirring action, the overflowing mixed slurry is sheared, emulsified and fully ground and refined through a 1# pipeline type emulsifying machine, the overflow enters a tertiary mixing tank, and the temperature of the secondary mixing tank is controlled to 165-168 ℃.
3) And (3) the slurry is continuously and strongly stirred in a third-stage mixing tank, the temperature is controlled to be 165 ℃, the overflowed slurry of the mixing tank is sheared, emulsified and fully ground and refined again through a No. 2 horizontal emulsifying machine, the overflowed slurry enters a mechanical granulator, the granulator sprays the slurry, the slurry is cooled through a tower bottom roller, the slurry is sieved, a second-stage powder flow cooler is used for cooling, and 5 kilograms of DMPP is sprayed in a film coating machine, so that the non-caking quick-acting long-acting water-soluble high-sulfur high-ammonium nitrogen nitro-sulfur nitrogen based nitrogen fertilizer 28-0-0 (the content of ammonium nitrogen is more than or equal to 17.5 percent, and the content of sulfur is more than or equal to 9 percent) is obtained.
The following are contents of the effect test examples.
Effect test example 1
The 26-0-0 high-sulfur fully water-soluble nitrosulfur nitrogen fertilizer granules prepared in example 1 were analyzed and tested to obtain the results shown in table 1 below:
TABLE 1 analysis and detection of high-sulfur, fully water-soluble nitro-thio nitrogen fertilizer particles
The fertilizer is stacked in 20 layers at the height, and is loose, free of agglomeration and pulverized within 6 months.
Effect test example 2
The 27-0-0 high-sulfur fully water-soluble nitrosulfur nitrogen fertilizer granules prepared in example 2 were analyzed and tested as shown in the following table 2, and the results were:
TABLE 2 analysis and detection of high-sulfur, fully water-soluble nitro-thio nitrogen fertilizer particles
The present invention is not limited to the above-described embodiments, and various changes and modifications of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (8)
1. A production method of high-sulfur full-water-soluble nitro-sulfur nitrogen fertilizer particles is characterized by comprising the following steps:
1) concentrating ammonium nitrate into 99% ammonium nitrate solution, and feeding the ammonium nitrate solution accounting for 44% or 51% or 58% of the total mass ratio into a first-stage mixing tank;
2) simultaneously adding a thickening agent accounting for 1-2% of the total mass ratio, a conditioning agent accounting for 2-4% of the total mass ratio and solid ammonium sulfate accounting for 25-35% of the total mass ratio after metering into a primary mixing tank, and fully mixing under the stirring action; the thickening agent is polyvinyl acetate or polyacrylamide; the conditioner is sodium dodecyl sulfate or sodium dodecyl sulfate;
3) solid ammonium sulfate accounting for 13-20% of the total mass ratio, the screened return materials of the finished product and the mixed slurry overflowing from the primary mixing tank enter a secondary mixing tank together, and are uniformly mixed under the strong stirring action;
4) and (3) the slurry is continuously and strongly stirred in a third-stage mixing tank, the slurry in the overflowing mixing tank is fully ground and porphyrized through shearing and emulsification, the overflowing slurry enters a mechanical granulator, the granulator sprays the slurry, and the non-caking quick-acting long-acting efficient full-water-soluble high-ammonium nitrogen nitro-sulfur nitrogen fertilizer is obtained through air cooling, screening, cooling by a second-stage powder flow cooler and spraying DMPP in a film coating machine.
2. The production method according to claim 1, wherein: in the step 1), the ammonium nitrate is concentrated into 99% ammonium nitrate solution which is conveyed to a high tower by a melting pump for two-stage evaporation; the metering is via a mass flow meter.
3. The production method according to claim 1, wherein: in the step 2), the metering is carried out by a metering belt under the tower; the temperature of the intensive mixing was controlled to 165-170 ℃.
4. The production method according to claim 1, wherein: in the step 3), the temperature of the secondary mixing tank is controlled to 165-168 ℃.
5. The production method according to claim 1, wherein: and 3), the overflowing mixture slurry is sheared, emulsified, fully ground and porphyrized through a pipeline type emulsifying machine, and overflows into a three-mixing tank.
6. The production method according to claim 1, wherein: in the step 4), the temperature of the third-stage mixing tank is controlled at 165-168 ℃.
7. The production method according to claim 1, wherein: and 4), shearing, emulsifying and fully grinding the overflowed slurry of the mixing tank by using a horizontal emulsifying machine.
8. The production method according to claim 1, wherein: in the step 4), the dosage of the DMPP is 3-5 kg.
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| CN112409071A (en) * | 2020-11-24 | 2021-02-26 | 南宁九禾测土配肥有限责任公司 | Water-soluble high-tower nitro-sulfenyl compound fertilizer suitable for high-pressure sprinkling irrigation equipment and preparation method thereof |
| CN113105286A (en) * | 2021-03-31 | 2021-07-13 | 广东凯米瑞特肥科技有限公司 | Preparation method of coated fertilizer with longer nutrition effect and coated fertilizer |
| CN114920605A (en) * | 2022-02-24 | 2022-08-19 | 天脊煤化工集团股份有限公司 | Phosphorus potassium nitrate type alginic acid compound fertilizer and preparation method thereof |
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